package org.bouncycastle.x509;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.x509.Attribute;

/**
 * Class for carrying the values in an X.509 Attribute.
 */
public class X509Attribute extends ASN1Encodable {
    Attribute attr;

    /**
     * @param at
     *            an object representing an attribute.
     */
    X509Attribute(ASN1Encodable at) {
        this.attr = Attribute.getInstance(at);
    }

    /**
     * Create an X.509 Attribute with the type given by the passed in oid and the value represented by an ASN.1 Set containing value.
     * 
     * @param oid
     *            type of the attribute
     * @param value
     *            value object to go into the atribute's value set.
     */
    public X509Attribute(String oid, ASN1Encodable value) {
        this.attr = new Attribute(new DERObjectIdentifier(oid), new DERSet(value));
    }

    /**
     * Create an X.59 Attribute with the type given by the passed in oid and the value represented by an ASN.1 Set containing the objects in value.
     * 
     * @param oid
     *            type of the attribute
     * @param value
     *            vector of values to go in the attribute's value set.
     */
    public X509Attribute(String oid, ASN1EncodableVector value) {
        this.attr = new Attribute(new DERObjectIdentifier(oid), new DERSet(value));
    }

    public String getOID() {
        return attr.getAttrType().getId();
    }

    public ASN1Encodable[] getValues() {
        ASN1Set s = attr.getAttrValues();
        ASN1Encodable[] values = new ASN1Encodable[s.size()];

        for (int i = 0; i != s.size(); i++) {
            values[i] = (ASN1Encodable) s.getObjectAt(i);
        }

        return values;
    }

    public DERObject toASN1Object() {
        return attr.toASN1Object();
    }
}
